The ground state electron configuration for an atom of sodium is A)1s² 2s² 2p⁶ 3s¹ B)1s² 2s² C)1s² 2s² 2p⁶ D)1s² 2s² 2p⁶ 3s² 3p⁴

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The correct electron configuration for sodium (Na), which has 11 electrons, is represented in option A as 1s^2 2s^2 2p^6 3s^1, following the Aufbau principle. This configuration shows the electrons filling the 1s, 2s, 2p, and finally the 3s orbitals, where sodium's valence electron resides.

The Ground State Electron Configuration for an Atom of Sodium